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Topic: Developing more plug-ins (Read 4413 times)

I'm going to start working on developing a plugin for Texas Instruments TI-99/4 and Atari 400/800/XE/XL since I happens to have cartridges for them laying around here. I'm going to post a link to a cartridge pinout for each and try to match pins to SNES or Mega Drive cartridge pinout. Think of this post as a work-in-progress journal, and requesting some info, if there's any, that might be helpful. This is going to be my first attempt at developing something, to be like Muzer.

The reason Atari has A0 and Mega Drive doesn't is that one is 8 bits and the other 16. Hence, for Mega Drive the smallest possible address increase is 1 word = 2 bytes. It might be easier to interface your cartridge with the SNES bus, which is also 8 bits wide.

Edit: Found this quote on another forum: It's a straight-forward job to dump a classic 8 or 16K type, but the larger types would need the program to detect their type and either dump them in stages, or use the extra RAM of an 800XL or 130XE.

Well then. I guess the order to proceed is then: (1) get the thing figured out, (2) set up a prototype (I'd suggest wiring the extra select / ROM present lines to the bank address, with RD* connected via 470ohm resistors), (3) send a first dump and tell me the exact wiring, (4) install refined firmware, (5) iterate until good.